package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginChekFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {

        HttpServletRequest request =(HttpServletRequest)servletRequest;
        HttpServletResponse response= (HttpServletResponse)servletResponse;
        //获取拦截请求的url
        String requestURI = request.getRequestURI();
        log.info("拦截了:{}",requestURI);
        String [] urls = new String[]{
                "/backend/**",
                "/front/**",
                "/employee/login",
                "/employee/logout",
                "/user/login",
                "/user/sendMsg",
                "/common/download"
        };
        //2 判断本次请求是否需要处理
        Boolean check = check(urls,requestURI);
        //3 如果不需要处理，则直接放行
        if (check){
            log.info("本次请求的url:{}不需要处理 直接放行",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        long id = Thread.currentThread().getId();
        log.info("线程id为：{}",id);
        //4 判断登录状态 如果已经登录就放行
//        log.info("employee式：{}",request.getSession().getAttribute("employee"));
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为{}可以放行",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee") ;
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //5 判断登录状态 如果已经登录就放行
//        log.info("employee式：{}",request.getSession().getAttribute("employee"));
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为{}可以放行",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user") ;
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("未登录");
        //5如果没有登录则返回没有登陆的结果 通过输出流方式响应给前端页面 让前端页面处理响应数据 进行页面跳转
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));//NOTLOGIN
        return;
    }

    private Boolean check(String[] urls, String requestURI) {
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
